Safety operating mechanism



H. DE SMITH.

SAFETY OPERATING MECHANISM.

APPLICATION FILED SEPT.22, 1914. RENEWED MAR-5,1918.

1,280,970. Patented Oct. 8, 1918.

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H. DE SMITH.

SAFETY OPERATING MECHANISM.

APPLlCATlON FILED szpnzz, 1914-. RENEWED MAR. 5. mu.

1,289,970. Patented Oct. 8, 1918.

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HENRY DE SMITH, OF ROCHESTER, NEW YORK, ASSIGNOR TO M. D. KNOWLTON COM- PANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

SAFETY OPERATING MECHANISM.

Specification of Letters Patent.

Patented Oct. 8, 1918.

Application filed September 22, 1914', Serial No. 862,893. Renewed March 5, 1918. Serial No. 220,618.

To all whom it may concern:

Be it known that I, HENRY DE SMITH, a citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Safety Operating Mechanism, of which the followsame is in close proximity to the work. At

all other times, no pressure is applied to the work-performing element, and, therefore, if the operators hand, or any other obstruction, is encountered, no harm will be done. 7

The object of the present 1nvent1on is to provide an improved device of this character which is simpler in its construction than previous devices and more efficient in its operation.

The improved safety device or safety operating mechanism may be applied to numerous different machines, but it has been illustrated in the accompanying drawings as applied to a box staying machine.

Referring to the drawings Figure 1 .is a front elevation of a portion of a box staying machine showing the safety operating mechanism applied thereto;

Fig. 2 is a side elevation of the construction shown in Fig. 1;

Fig. 3 is an enlarged detail view of the safety operating mechanism or safety link;

and

Fig. 4 is a side elevation, partly in section, of the construction shown in Fig. 3.

The box staying machine illustrated is of the usual construction, and comprises a movable die A carried by the slide B and a stationary die or anvil C. The slide B is provided with a pin D, which is connected, by

means of a pitman or link, to the usual eccentrically mounted crank pin E, provided on the actuating shaft F.

The link above referred to between the crank pin E and the pin D is so constructed as to constitute the safety device hereinbefore mentioned. In the present instance, the safety device or safety link comprises the link proper 1, which is mounted at its upper end on the crank pin E, a bushing 2 preferably being interposed between the journal of the crank pin and the bearing of the link. The lower end of the link 1 is provided with an elongated opening 3, in which the pin D is adapted to engage, and in which it is freely slidable.

The link 1 is provided, at its upper end, with a rearwardly directed hub portion encircling the crank pin E, and serving as a journal for a depending gag 5. A spring 6, positioned in a recess 7 common to both the link 1 and gag 5, acts against a plug 8 screwed into the gag 5, and tends to hold said gag in the substantially vertical position shown in Fig. 3. When in such position, power will be transmitted from the crank pin E, through the intermediary of the gag 5, to the pin D.

he gag is normally held in the position represented by dot and dash lines in Fig. 8, by'means of a cam 9, preferably formed as an integral part of the crank pin E. This cam acts upon a cam lever 10, which is riveted to a depending finger 11, journaled in the link 1, as shown at 12. The depending finger 11 is positioned at the inner side of the link 1, and engages in an appropriately formed depression or recessed portion 13 in the cam lever 10 will be transmitted to the gag 5 by means of the finger 11 and cause the gag to assume the position shown by the dot and dash lines in Fig. 3. The cam 9 will hold the gag in this position until the die A comes within approximately -.of an inch of the work to be operated upon on the down stroke of the link, at which time, the cam 9v will assume the position shown in Fig. 3., and permit the lever'lO to swing the gag 5 to its substantially vertical position. The actuating means, or the crank pin E, is then positively connected with the pin D, and the.

gag serves as rigid means for transmitting pressure from the actuating means to the movable die A. If, however, the movable die A meets with an obstruction, such as the operators hand, during the down stroke of the link, the movable die A and pin 'D will be held stationary by the obstruction, and as the gag is in its inoperative position, the link 1 will move. downwardly relative to the pin D, due to the provision of the elongated opening 3. As no pressure is at that time being applied to the pin D, it is obvious that the operators hand, or other obstruction, will be uninjured. The movable die A must be approximately% of an inch from the work before pressure can be applied to the die by the gag, and, therefore, any obstacle greater in thickness than i; of an inch, will cause no harm, as the link and gag will merely descend under such circumstances Without transmitting pressure to the die. On the up stroke ofthe link, the movable dieA, slide B,

" and pin D are lifted by the link, and on the other, or'telescope, as has been the case in i down stroke of thelink, the pin D still remains in the lower part of the opening 3, due to the weight of the slide. The pin D,

therefore, always occupies the position' showninr Fig. 8, to wit, in the lower part of the opening 3, except when the, die meets with'an obstruction, at which time, the link will move downwardly relative to the pin D and cause said pin to occupy the upper part of the opening 3.

' From the foregoing construction, it will be noted that practically no resistance is offered to the yielding or relative movement of the parts when an obstruction is encountered, as no parts have to slide upon each previous devices of the samegeneral character.

'What I claim is 1. In a'mach-ine of the kind described,the

combination with the work-performing ,ele-

ment and its actuating means, of a link yieldingly connected with the work-performing element to' cause, the latter to operate when the actuating means is in operation but designed to permit the work performing element to yield with respect to the link if an obstruction is encountered during the working stroke of the workperforming element, a normally inoperative gag pivotally associated with the actuating means and adapted to be shifted to an operative position between the actuatlng meansand the work-performing element in which it acts as a rigid power-transmitting means, and; means including a cam asso- .ciated withfthe actuating means for autowork-performing element, a normally inop- GIiLtlVe gag mounted to swing about said crank pin asan aXis and adapted to occupy a position between the crank pinand .the

work-performing element in which j-it acts as a rigid power-transmitting means,a cam associated with the actuating means, and meanswhereby said cam controls the movement of said gag.

3. In a machine of the kind described, the combination with the work-performing element and its actuating means, of a link yieldingly connected with the work-performing element to cause the latter to operate when the actuating means is in operation but designed to permit the work-performing element to yield with respect to the link if an obstruction is encountered during the working stroke of the work-performing element, a normally inoperative gag pivotally associated with the actuating.

means and adapted to be shifted to an op erative position between the actuating means and the work-performing element in which it acts as a rigid power-transmitting means, meanstending to shift the gag to its operative position, and means associated with the actuating means for controlling the movement of the gag so that 1t will bev automatically shiftedto its operative position on each "working stroke of the worlo performing element just prior to the engagement of the, work by the work-performing element.

at. In a machine of the kind described having an actuating crank pin and'a pin associated with the. worlrperforming element, of a'l'ink connecting the two and loosely connected with the pin of the work-performing element, a normally inoperative gag pivotally associated'with the crank pin and adapted to vbe shifted to an operative position in which it serves as a rigidpowertransmitting member between the crank pin and the pin of the work-performing element, and means including a cam associated Signed at Rochester, in the county of with the crank pin for automatically efi'ect- Monroe and State of New York, this 12th ing shifting of the gag to its operative posiday of September, A. D. 1914.

tion on each Working stroke of the work- HENRY DE SMITH. 5 performing element just prior to the en- Witnesses:

gagement of the Work by the Work-perform- Trros. D. PATTON,

ing element. ROBERT J. GARRISON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

